well I will make a post more complete about my current session (if the save games are not erased before my next gaming time ^^) but one REALLY important problem needed to be pointed out !!
OK the conversation system is more clear now that the options already used are erased, but what if you click too fast, miss an information or want to check a previous part of the conversation?!!
I have sevral options in mind
-a conversation log (but it might me too messy
-just shade or change the color of the conversation options already used instead of deleting it
-another conversation option which contains the options already used
